A New Method for Ship Control Valve Overload Protection in Complex Marine Environments

Epoxy coated reinforcements have been used extensively in bridge decks and substructures to protect against corrosion brought on by de-icing salts or marine environments. They need longer development lengths because of poor bond to concrete and special treatments on sites due to vulnerability of damage during transportation, storage and bending process. A new method of pre-heating of reinforcement before coating process using an IGBT(Insulated Gate Bipolar Transistor) control was applied to improve the bond of epoxy coating to reinforcements. In this paper, the bond-slip properties of newly developed epoxy coated bars are investigated and compared to those of black bars. The direct pull out test according to EN Standard was used with varying the diameters of reinforcements. The experimental results show that the new process is very efficient in increasing bond capacity of epoxy coated bars to concrete comparing those of traditional ones.

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The Diagnostis Method of Control Valve Stiction

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.389.501 ◽

2013 ◽

Vol 389 ◽

pp. 501-506

Author(s):

Qun Li Shang ◽

Zheng Ding

Keyword(s):

Signal Processing ◽

Control System ◽

Output Signal ◽

Control Valve ◽

New Method ◽

System Model ◽

Control Loop ◽

Valve Stiction ◽

Process Output ◽

Control System Model

Valve stiction is one of the main reasons which lead to control loop oscillation.However, there is not a mature method to diagnose the stiction.Under the premise of unknown the control system model,this paper put forward a new method based on the process output signal processing to realize control valve stiction of fault diagnosis.The results of the experiment and simulation to show that the method is effective.

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Control Valve Stiction Compensation - Part I: A New Method for Compensating Control Valve Stiction

Industrial & Engineering Chemistry Research ◽

10.1021/acs.iecr.9b00334 ◽

2019 ◽

Vol 58 (26) ◽

pp. 11316-11325 ◽

Cited By ~ 1

Author(s):

Ahaduzzaman Nahid ◽

Ashfaq Iftakher ◽

M. A. A. Shoukat Choudhury

Keyword(s):

Control Valve ◽

New Method ◽

Valve Stiction

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Development of a High-Performance Choke Valve with Reference to Sizing for Multiphase Flow

Measurement and Control ◽

10.1177/002029409102400902 ◽

1991 ◽

Vol 24 (9) ◽

pp. 273-281 ◽

Cited By ~ 2

Author(s):

E W Singleton

Keyword(s):

High Pressure ◽

Pressure Drop ◽

Multiphase Flow ◽

High Performance ◽

Control Valve ◽

New Method ◽

Flow Conditions ◽

Valve Design ◽

Wide Range ◽

Multiphase Fluids

The paper describes events leading up to the development of a variable choke valve for high-pressure drop service on multiphase fluids. During the evolvement of the design, which has now been proved in service, it was found necessary to discard some of the accepted precepts and conventions of control valve design. This work also led to an investigation into the various methods of sizing valves for multiphase fluids. The results obtained from available methods were compared and a new method was devised which appears to maintain a higher level of accuracy over a wide range of multiphase flow conditions.

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Selective Sampling and Orientation of Non-Homogeneous Tissues

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100100238 ◽

1968 ◽

Vol 26 ◽

pp. 98-99

Author(s):

C. C. Clawson ◽

L. W. Anderson ◽

R. A. Good

Keyword(s):

Electron Microscopy ◽

Electron Microscope ◽

Light Microscopy ◽

Random Sampling ◽

New Method ◽

Microscope Examination ◽

Small Areas ◽

Selective Sampling ◽

Large Numbers ◽

Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

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